关于使用itextpdf7提取pdf文件中指定关键字内容的坐标位置

参考文章和资料

老梁 - https://cloud.tencent.com/developer/article/1502408
微光•无单位 - https://blog.youkuaiyun.com/LvWeijie941/article/details/105248627/
官方api - https://api.itextpdf.com/iText7/java/7.0.5/

前言

具体版本为itexpdf7.0.4，使用Maven项目管理依赖
主要使用jar包： kernel-7.0.4.jar

转载请注明出处

配置

为所有Maven项目配置远程仓库m2/settings.xml

<?xml version="1.0" encoding="UTF-8"?>
<settings> 
<localRepository>m2</localRepository><!--需要改成自己的maven的本地仓库地址-->
    <mirrors>
        <mirror>
            <id>alimaven</id>
            <name>aliyun maven</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <mirrorOf>central</mirrorOf>
        </mirror>
    </mirrors>
  <profiles>
    <profile>
       <id>nexus</id> 
        <repositories>
            <repository>
                <id>nexus</id>
                <name>local private nexus</name>
                <url>http://maven.oschina.net/content/groups/public/</url>
                <releases>
                    <enabled>true</enabled>
                </releases>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
        
        <pluginRepositories>
            <pluginRepository>
            <id>nexus</id>
            <name>local private nexus</name>
            <url>http://maven.oschina.net/content/groups/public/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            </pluginRepository>
        </pluginRepositories>
    </profile></profiles>
</settings>
 

具体项目通过pom.xml文件配置依赖(通过远程仓库自动在线下载依赖，即可无须手动下载jar包)

<dependencies>
	<dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>kernel</artifactId>
            <version>7.0.4</version>
	</dependency>
</dependencies>

具体运行代码

import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.canvas.parser.PdfDocumentContentParser;
import com.itextpdf.kernel.pdf.canvas.parser.listener.IPdfTextLocation;
import com.itextpdf.kernel.pdf.canvas.parser.listener.RegexBasedLocationExtractionStrategy;

import java.util.Collection;

public class test {
    public static void main(String args[]){
        String input = "target.pdf";
        //通过指定pdf文件名，指定关键字，和指定的pdf文件的待处理页数做参数
        getKeyWordsLocation(input, "presented", 46);
    }

    public static void getKeyWordsLocation(String input, String key, int pageNum){
        RegexBasedLocationExtractionStrategy strategy = new RegexBasedLocationExtractionStrategy(key);

        try{
        	//核心思路为对PdfDocument对象采用某种Strategy，这里使用RegexBasedLocationExtractionStrategy
            PdfReader pr = new PdfReader(input);
            PdfDocument pd = new PdfDocument(pr);
            PdfDocumentContentParser pdcp = new PdfDocumentContentParser(pd);

			//文本内容具体解析借助使用PdfDocumentContentParser类(实质使用PdfCanvasProcessor进行处理)， 对待处理页面装配合适策略
            RegexBasedLocationExtractionStrategy regexStrategy =
                    pdcp.processContent(pageNum, strategy);
			//获取处理结果
            Collection<IPdfTextLocation> resultantLocations = strategy.getResultantLocations();
            //自定义结果处理
            if (!resultantLocations.isEmpty()){
                for(IPdfTextLocation item: resultantLocations){
                    Rectangle boundRectangle = item.getRectangle();
                    System.out.println(item.getText());
                    System.out.println("["+key + "] location of x: " + boundRectangle.getX() + "  ,y: " + boundRectangle.getY());
                }
            }
            else {
                System.out.println("the result is null");
            }
            pr.close();
            pd.close();

        }catch (Exception e){
            System.err.println("read file failed!");
            e.printStackTrace();
        }
    }
}